Another source I've used quite a bit is Fly Fast Composites. They have a 500 MAH NIMH that I used before I went digital, also, quite a bit cheaper. Than again, there 900 mah NIMH pack is about the same weight as the expert pack.

http://www.flyfastcomposites.com/pro...ccessories.htm

They are also in Canada, may be easier for you. Call Terrence before ordering, he doesn't always have them in stock, although its been a while since I ordered some from him.